page_title: Honda Civic GX
section_title: Specifications
hierarchical_section_title: Honda Civic GX / Specifications
caption_attribution_description: English: Zoom in of the 2012 Honda Civic GX compressed natural gas (CNG) vehicle badging. 2012 Washington Auto Show (D.C.)
context_page_description: The Honda Civic GX was the only car factory-built to run on compressed natural gas in the United States available to non-fleet customers. The GX was based on the Honda Civic and available for fleet sales in all 50 states. It was previously available for retail sales in four states, but later was made available to retail consumers in 35 states throughout the United States. The GX was manufactured in Honda's Greensburg, Indiana, plant together with the production of conventional Civics from late 2009. It was previously produced in East Liberty, Ohio.
  The third generation GX was awarded the 2012 Green Car of the Year by the Green Car Journal in November 2011 at the Los Angeles Auto Show. For eight years up to 2011, the Civic GX was rated first by the American Council for an Energy-Efficient Economy in the "Greenest Vehicle of the Year" list For 2012 the GX was surpassed by the Mitsubishi i-MiEV. For 2014, the GX ranked 10th, after several hybrids and electric vehicles. 2015 was the last model year for the Civic GX.
context_section_description: The GX was originally introduced with a 1.6 liter inline-four engine (I4). The 2001 model makeover carried a 1.7 liter engine. Beginning in model-year 2006, the 1.8 liter inline four-cylinder engine was introduced to the civic lineup. The
  compression ratio in the Civic GX is 12.5:1, higher than that of most United States gasoline-powered automobiles. The significantly higher compression ratio is usable without detonation due to the 120-octane natural gas that powers the car. Acceleration of the 2012 Civic Natural Gas is less than that of the comparable 4-door 2012 LX model due to both lower power (110 hp vs. 140 hp) and heavier weight (2848 lbs vs 2705 lbs). Times from a standing start to 60 miles per hour (100 km/h) have been clocked at 12.6 seconds.
  The cylinder containing the high-pressure fuel is carried in the trunk of the car and holds 8.0 gasoline gallon equivalent (GGE) at 3,600 psi (250 bar).
  Range on a full 3,600 psi fill is variable, depending on driving conditions and driving technique. While Honda claims an estimated 225–250 miles from a full CNG tank, independent tests have found lower ranges of 180–200 miles and "just over 200 miles" (about 300 km). There were improvements in the 2012 EPA fuel economy as the range increased to 225~250 miles. The EPA rates the 2009 Honda Civic GX at 24 equivalent miles per gallon (MPG) city and 36 equivalent MPG highway. Independent tests with mixed driving usage found rates of "nearly 32" and 26.8 equivalent MPG. The estimated fuel cost for this vehicle to drive 25 miles in a combination of city and highway driving is US$1.47 using CNG, based on an average fuel price of US$1.93 per gasoline equivalent gallon (121.5 cubic feet).
  The GX qualifies for high-occupancy vehicle lane (HOV) access in California, Arizona, Utah, and other states.
caption: 2012 Honda Civic GX with the blue diamond CNG sticker and the new natural gas badging
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